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Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2024

Effects of hydrostatic pressure on amorphous chiral materials: Impact on homochiral or heterochiral H-bond sequences

Résumé

High pressure effects on static dielectric permittivity of homochiral and heterochiral N-acetyl-α-methyl-benzylamine (Nac-MBA) were investigated. For homochiral composition, the static permittivity increases of 178% with pressure at T = 388 K. Interestingly, as pressure continued increasing, εS drastically collapsed to reach ε∞ = 3 ± 0.3. In the case of heterochiral composition, the static permittivity increases with pressure (in the same magnitude order as the pure enantiomer), and reaches a constant value depending on the isothermal temperature. Thus, the size of the H-bond aggregates is highly pressure sensitive, increasing up to a level that crystallization becomes unavoidable. For heterochiral composition, this process may be kinetically time consuming since the initial heterochiral H-bond aggregates need to be surrounded by their suitable neighbors in order to fulfilled the crystalline packing. The initial H-bond sequences are the precursors of the future crystalline arrangement under pressure application.

Dates et versions

hal-04636715 , version 1 (05-07-2024)

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Citer

Bienvenu Atawa, Nicolas Couvrat, Frederic Affouard, Natália Correia, Gérard Coquerel, et al.. Effects of hydrostatic pressure on amorphous chiral materials: Impact on homochiral or heterochiral H-bond sequences. Journal of Non-Crystalline Solids, 2024, 640, pp.123111. ⟨10.1016/j.jnoncrysol.2024.123111⟩. ⟨hal-04636715⟩
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